Fix the potential DB crash caused by call EndTrace before StartTrace (#5130)
Summary: Although user should first call StartTrace to begin the RocksDB tracing function and call EndTrace to stop the tracing process, user can accidentally call EndTrace first. It will cause segment fault and crash the DB instance. The issue is fixed by checking the pointer first. Test case added in db_test2. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5130 Differential Revision: D14691420 Pulled By: zhichao-cao fbshipit-source-id: 3be13d2f944bc453728ef8eef67b68d7ad0939c8
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